Example usage for java.io RandomAccessFile close

List of usage examples for java.io RandomAccessFile close

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Introduction

In this page you can find the example usage for java.io RandomAccessFile close.

Prototype

public void close() throws IOException

Source Link

Document

Closes this random access file stream and releases any system resources associated with the stream.

Usage

From source file:Cat.java

public static void concatenate(String fileName) {
    RandomAccessFile file = null;
    String line = null;/*from   w ww.  ja v a2s  .c o m*/

    try {
        file = new RandomAccessFile(fileName, "r");
        while ((line = file.readLine()) != null) {
            System.out.println(line);
        }
        return;
    } catch (FileNotFoundException fnf) {
        System.err.println("File: " + fileName + " not found.");
    } catch (Exception e) {
        System.err.println(e.toString());
    } finally {
        if (file != null) {
            try {
                file.close();
            } catch (IOException io) {
            }
        }
    }

}

From source file:Main.java

private static byte[] readFileToBuffer(String filePath) {
    File inFile = new File(filePath);
    if (!inFile.exists()) {
        Log.d(TAG, "<readFileToBuffer> " + filePath + " not exists!!!");
        return null;
    }//w w  w.  j a v  a2 s .  c  o m

    RandomAccessFile rafIn = null;
    try {
        rafIn = new RandomAccessFile(inFile, "r");
        int len = (int) inFile.length();
        byte[] buffer = new byte[len];
        rafIn.read(buffer);
        return buffer;
    } catch (IOException e) {
        Log.e(TAG, "<readFileToBuffer> Exception ", e);
        return null;
    } finally {
        try {
            if (rafIn != null) {
                rafIn.close();
                rafIn = null;
            }
        } catch (IOException e) {
            Log.e(TAG, "<readFileToBuffer> close IOException ", e);
        }
    }
}

From source file:org.apache.hadoop.dfs.TestDatanodeBlockScanner.java

private static void truncateReplica(String blockName, int dnIndex) throws IOException {
    File baseDir = new File(System.getProperty("test.build.data"), "dfs/data");
    for (int i = dnIndex * 2; i < dnIndex * 2 + 2; i++) {
        File blockFile = new File(baseDir, "data" + (i + 1) + "/current/" + blockName);
        if (blockFile.exists()) {
            RandomAccessFile raFile = new RandomAccessFile(blockFile, "rw");
            raFile.setLength(raFile.length() - 1);
            raFile.close();
            break;
        }/*w w  w  .j  a va 2 s .co  m*/
    }
}

From source file:com.lightbox.android.bitmap.BitmapUtils.java

public static void writeBitmapInFile(File file, Bitmap bitmap, CompressFormat compressFormat,
        StringBuilder outMD5) throws IOException {
    // Ensure that the directory exist
    file.getParentFile().mkdirs();//from w  w w . java 2  s.  co m

    OutputStream outputStream = null;
    try {
        if (outMD5 != null) {
            // We want a MD5: writing JPEG into a byte array
            outputStream = new ByteArrayOutputStream();
        } else {
            // Directly write to file
            try {
                outputStream = new BufferedOutputStream(new RandomAccessFileOutputStream(file), 65536);
            } catch (OutOfMemoryError e) {
                outputStream = new BufferedOutputStream(new RandomAccessFileOutputStream(file));
            }
        }
        boolean success = bitmap.compress(compressFormat, FULL_QUALITY, outputStream);
        if (!success) {
            throw new IOException(String.format("Unable to save bitmap as a %s file: %s",
                    (compressFormat == CompressFormat.JPEG) ? "jpeg" : "png",
                    file.getAbsoluteFile().toString()));
        } else {
            if (outMD5 != null) {
                // Calculate MD5 and write the file to disk
                long time = System.currentTimeMillis();
                byte[] jpeg = ((ByteArrayOutputStream) outputStream).toByteArray();
                if (outMD5 != null) {
                    outMD5.append(getMD5String(jpeg));
                }
                DebugLog.d(TAG, "Time to calculate MD5: " + (System.currentTimeMillis() - time));

                time = System.currentTimeMillis();
                RandomAccessFile randomAccessFile = new RandomAccessFile(file, "rwd");
                randomAccessFile.write(jpeg);
                randomAccessFile.close();
                DebugLog.d(TAG, "Time to write to file: " + (System.currentTimeMillis() - time));
            }
        }
    } finally {
        IOUtils.closeQuietly(outputStream);
    }
}

From source file:org.apache.hadoop.hdfs.TestDatanodeBlockScanner.java

/**
 * Change the length of a block at datanode dnIndex
 *///  w ww  .j  a v  a2 s. c  o  m
static boolean changeReplicaLength(String blockName, int dnIndex, int lenDelta) throws IOException {
    File baseDir = new File(System.getProperty("test.build.data"), "dfs/data");
    for (int i = dnIndex * 2; i < dnIndex * 2 + 2; i++) {
        File blockFile = new File(baseDir, "data" + (i + 1) + "/current/" + blockName);
        if (blockFile.exists()) {
            RandomAccessFile raFile = new RandomAccessFile(blockFile, "rw");
            raFile.setLength(raFile.length() + lenDelta);
            raFile.close();
            return true;
        }
    }
    return false;
}

From source file:eu.delving.metadata.Hasher.java

public static String quickHash(File file) throws IOException {
    Hasher hasher = new Hasher();
    RandomAccessFile raf = new RandomAccessFile(file, "r");
    byte[] chunk = new byte[QUICK_SAMPLE_SIZE];
    long length = raf.length() - chunk.length;
    long step = length / QUICK_SAMPLES;
    for (int walk = 0; walk < QUICK_SAMPLES; walk++) {
        raf.seek(step * walk);//from w w  w. ja v a  2s.  com
        raf.readFully(chunk);
        hasher.update(chunk, chunk.length);
    }
    raf.close();
    return hasher.getHashString().substring(4, 14);
}

From source file:org.apache.hadoop.hdfs.TestClientReportBadBlock.java

/**
 * Corrupt a block on a data node. Replace the block file content with
 * content/*www .  j ava  2  s.c  o  m*/
 * of 1, 2, ...BLOCK_SIZE.
 *
 * @param block
 *     the ExtendedBlock to be corrupted
 * @param dn
 *     the data node where the block needs to be corrupted
 * @throws FileNotFoundException
 * @throws IOException
 */
private static void corruptBlock(final ExtendedBlock block, final DataNode dn)
        throws FileNotFoundException, IOException {
    final File f = DataNodeTestUtils.getBlockFile(dn, block.getBlockPoolId(), block.getLocalBlock());
    final RandomAccessFile raFile = new RandomAccessFile(f, "rw");
    final byte[] bytes = new byte[(int) BLOCK_SIZE];
    for (int i = 0; i < BLOCK_SIZE; i++) {
        bytes[i] = (byte) (i);
    }
    raFile.write(bytes);
    raFile.close();
}

From source file:Main.java

public static ByteBuffer fromFile(File file) throws IOException {
    RandomAccessFile raf = null;
    FileChannel channel = null;/*from w w  w  .  j a  va  2  s . c o m*/
    try {
        raf = new RandomAccessFile(file, "r");
        channel = raf.getChannel();
        return channel.map(FileChannel.MapMode.READ_ONLY, 0, file.length()).load();
    } finally {
        if (channel != null) {
            try {
                channel.close();
            } catch (IOException e) {
                // Ignored.
            }
        }
        if (raf != null) {
            try {
                raf.close();
            } catch (IOException e) {
                // Ignored.
            }
        }
    }
}

From source file:com.geekandroid.sdk.pay.utils.Util.java

public static byte[] readFromFile(String fileName, int offset, int len) {
    if (fileName == null) {
        return null;
    }//from  w w w. j a va 2s.  c om

    File file = new File(fileName);
    if (!file.exists()) {
        Log.i(TAG, "readFromFile: file not found");
        return null;
    }

    if (len == -1) {
        len = (int) file.length();
    }

    Log.d(TAG, "readFromFile : offset = " + offset + " len = " + len + " offset + len = " + (offset + len));

    if (offset < 0) {
        Log.e(TAG, "readFromFile invalid offset:" + offset);
        return null;
    }
    if (len <= 0) {
        Log.e(TAG, "readFromFile invalid len:" + len);
        return null;
    }
    if (offset + len > (int) file.length()) {
        Log.e(TAG, "readFromFile invalid file len:" + file.length());
        return null;
    }

    byte[] b = null;
    try {
        RandomAccessFile in = new RandomAccessFile(fileName, "r");
        b = new byte[len]; // ??
        in.seek(offset);
        in.readFully(b);
        in.close();

    } catch (Exception e) {
        Log.e(TAG, "readFromFile : errMsg = " + e.getMessage());
        e.printStackTrace();
    }
    return b;
}

From source file:Main.java

public static byte[] getAsBinary(String key) {
    RandomAccessFile RAFile = null;
    boolean removeFile = false;
    try {//w ww. ja v  a  2  s  . c  o  m
        File file = new File(cacheDir, key);
        if (!file.exists())
            return null;
        RAFile = new RandomAccessFile(file, "r");
        byte[] byteArray = new byte[(int) RAFile.length()];
        RAFile.read(byteArray);
        return byteArray;
    } catch (Exception e) {
        e.printStackTrace();
        return null;
    } finally {
        if (RAFile != null) {
            try {
                RAFile.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

    }
}